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There is the post but might be cheaper to buy one than post it back and forth.
The car is a diesel (ad Blue is a diesel thing)so not sure, the 1.6 isn't a wet belt.
Think the french car forum have details of people with the lexia cable and diagbox software that could give you an insight what the code is. Can check if my lexia (one Citroen OBD2) cables are the right version to read the ECU and then you'd have to download the diagbox software.
Ta, I'm up in mcr though so maybe tricky?
I don't know tbh. How to tell?